Mud pumps



Dec. 29, 1964 J. H. wlLsoN 3,163,474

MUD PUMPS Original Filed June 6, 1956 3,163,474 MUD PUMPS lohn Hart Wilson, Wilson Manufacturing Co., lne., P). Een 10.31, Wichita 'Ealls, Tex.

@riginal application .lune 6, 1956, Ser. No. 559,752, now Patent No. 3,033,124, dated May 3, 1962. Divided and this application Sept. 7, 1961, Ser. No. 136,672 4 Claims. (Ci. 303-3) This invention relates to improvements in pumps and more particularly to pumps used for pumping drilling iiuid, such as viscous mud and/or solutions of hematites, barites, bentonite clays, gels, and other fluids carrying additives to increase the weight and/or viscosity of drilling fluid pumped into the bore hole of a well being drilled by the rotary drilling method.

This application is a division of my co-pending application Ser. No. 589,752, led lune 6, 1956, for Mud Pumps, now Patent No. 3,033,124, dated May 8, 1962, which application is a continuation-in-part of my prior application Ser. No. 480,445, filed January 7, 1955, for Crank Assembly, now Patent No. 2,899,744, dated August 18, 195,9.

Various mud or slush pumps have been proposed heretofore, but these were usually of relatively heavy construction, and the body parts of the pump were usually of heavy cast construction; therefore, a pump of large pumping capacity was heavy and cumbersome in proportion to the amount of iluid handled.

The present pump is designed to include structural features which will result in a pump which is relatively light in weight, yet the construction of which. will equal or exceed in strength, a much heavier pump. The pump case is provided with openings both in the sides and top thereof, thereby to provide maximum accessibility into the packing chamber, both to the piston rod glands and to the pony rod glands, and also for the removal of the piston rods. v p

The present pump is designed to be of such capacity as to handle a volume of fluid which will equal or exceed the amount of lluid handled by many pumps now in use, which are larger and heavier.

An object of the invention is to provide a crosshead bearing on the connecting rod of the pump, whereby the load will equalize over the entire bearing,l even if the connecting rod is slightly out of alignment with the axis of the pump.

With these objects in mind, and others whichwill become manifest as the description proceeds, reference is to be had to the accompanying drawings, in which like reference characters designate like parts in the several views thereof, in which: i

FIG. 1 is a longitudinal, sectional view to show the interior details of construction of the pump; and

FIG. 2 is an enlarged, transverse, sectional view taken through the crosshead, to show the details of construction.

The case of the mud pump which includes the present invention has a crankshaft mounted transversely thereof within bearings. Connecting rods are connected to the crankshaft in a manner set forth in my application Ser. No. 480,445, Crank Shaft Assembly, tiled January 7, 1955, now Patent No. 2,899,744, dated Aug. 18, 1959, of which application Ser. No. 589,752, Mud Pumps, filed June 6, 1956, is a continuation-in-part, and which is copending with this application. n

Attached'to the respective throws ofthe crankshaft are connecting rods, each of which connects with a crosshead, as shown in FIGS.V 1 and 2, which cross head is designated by the numeral 10. The connecting rod 11` has a pair of annular bushings A12 therein, the inner sur- ,United States Patent O 3,153,474 Patented Dec. 29, 1954' in complementary relation with an annular bearing 13,

which bearing is preferably made of bearing bronze, and which has a spherical outer face. The annular bushings 12 are held in place by annular rings 14, which surround the bushings'12 and are bolted to the connecting rod 11 by means of cap screws 15.

An annular ring 16 surrounds the crosshead wrist pin 17, the ends of which pin 17 are tapered. There is a slight clearance, usually about .010, between the outer diameter of the annular ring 16 and the inner diameter of the annular ring 14. In this manner a limited rotary movement, of the connecting rod and associated parts about its longitudinal axis, with respect to the spherical bearing ring 13 and crosshead wrist pin 17 is possible, so as to permit limited self alignment of the respective parts. A cap ring 18 is provided on each side of each crosshead 10, so as to hold annular wedge rings 19 in contact with the taper 20 of the crosshead Wrist pin 17 and with the inner diameter ofthe bore of the crosshead 1t). The cap ring 1S is held in place by means of bolts 21, as will best be seen in FIG. 2. The respective crosshead wrist pin 17 are each drilled and cross drilled t0 provide lubricant channels, which Achannels lead to grooves formed on the outer diameter of the pin 17 in the respective crossheads 10. A lubricant connection 22 is screw threaded into an end of each crosshead wrist pin 17, which lubricant connection is in communication with the respective passages 23 and 24 which lead to the longitudinal grooves formed in the'top and bottom only of crosshead Wrist pins 17.

A pony rod 25 is screw threaded into one end of each crosshead 10, as will best be seen in FIG. 1. The threads engaging the respective crossheads are preferably tapered and each has a lock nut 26 screw-threaded onto the respective pony rods 25, so as to abut with the respective crossheads 1li to securely hold the respective pony rods 25 in place.

A piston rod 27 is screw-threaded into pony rod 25, which piston rod 27 extends through a gland and connects with a piston which is fitted within a pump cylinder liner of the character as set forth in my co-pending application Ser. No. 454,082, tiled Sept. 3, 1954, for Cylinder Assembly, now Patent No. 2,832,653, dated April 29, 1958.

Having thus described the invention, what is claimed is:

l. In a crosshead construction, a body having slide surfaces formed on opposite sides thereof, said body having an opening formed in an end thereofwhich extends thereinto for a portion of the length thereof, an apertured connecting rod extending into said opening, a transverse opening formed through said body at right angles to said i' slide surfaces and said transverse opening being adapted respect to said body, a parti-spherical bearing ring meml pair of concave, complemen-y ber fitted on said wrist pin, a tary annular rings fitted within said aperture of said connecting rod, the concave bearing ring member, and means for retaining said pair of concave, annular relation with said parti-spherical ring member.

2. A crosshead construction as set forth in claim 1,

, `wherein the end portions Vof said Wrist pin taper outward toward the axis thereof, and complementarily tapered annular rings are tted within said transverse opening and wedgingly engage the respective tapered endl portions of face of each-bushing being spherical and which interfits Y said wrist pin.

3. A crosshead construction as set forth in claim l,

wherein said means for retaining said concave annular portions of said pair of ringsi tting in complementary relation with said parti-spherical ring members in close fitting, bearing rings. include an annular ring member on each side of said connecting rod and which rings are secured thereto by means of bolts, and a second annular ring mounted on each side of said parti-spherical ring member with a limited space 'rbetween said 'lasts two mentionedV annular ring members so as to allow limited alignment along the References Cited in the le of this patent UNITED STATES PATENTS Knape Sept. 24, 1929 Hoke Sept. 24, 1940 Rambo et al Mar. 16, 1948 Wilhelm Apr. 17, 1951 Heim Apr. 13,19544 Maier June 29, 1954 

1. IN A CROSSHEAD CONSTRUCTION, A BODY HAVING SLIDE SURFACES FORMED ON OPPOSITE SIDE THEREOF, SAID BODY HAVING AN OPENING FORMED IN AN END THEREOF WHICH EXTENDS THEREINTO FOR A PORTION OF THE LENGTH THEREOF, AN APERTURED CONNECTING ROD EXTENDING INTO SAID OPENING, A TRANSVERS OPENING FORMED THROUGH SAID BODY AT RIGHT ANGLES TO SAID SLIDE SURFACES AND SAID TRANSVERSE OPENING BEING ADAPTED TO REGISTER WITH SAID APERTURE IN SAID CONNECTING ROD WHEN SAID CONNECTING ROD IS FITTED IN PLACE, A WRIST PIN PASSING THROUGH SAID TRANSVERSE OPENING AND BEING SECURED WITH RESPECT TO SAID BODY, A PARTI-SPHERICAL BEARING RING MEMBER FITTED ON SAID WRIST PIN, A PAIR OF CONCAVE, COMPLEMENTARY ANNULAR RINGS FITTED WITHIN SAID APERTURE OF SAID CONNECTING ROD, THE CONCAVE PORTIONS OF SAID PAIR OF RINGS FITTING IN COMPLEMENTARY RELATION WITH SAID PATI-SPHERICAL BEARING RING MEMBER, AND MEANS FOR RETAINING SAID PAIR OF CONCAVE, ANNULAR RING MEMBERS IN CLOSE FITTING, BEARING RELATION WITH SAID PARTI-SPHERICAL RING MEMBER. 